Have a magnavox 31mf231d power board issue, replaced all caps. Had 1 obvious bad (2074). when powering up I get good power light, backlights come on, but only get gray screen. no menu, no controls. Also have a toshiba doing the same thing. I suspect that the tconn is not getting power. Is there a switch that may have been overloaded from bad cap. Looks like 7073 may be a transistor of some sort and appears to be in this circuit. Any suggestions?

It depends. There is a micro-processor IC on it that is irreplaceable. As for your model number I do not remember seesing a 31MF231D. If its a 32MF231D, I have a comprehensive service manual that I can give you. It should make your job a lot easier. Ofcourse I will guide you if you need something. So the first thing you should check is the model number. A google search for your model returns hardly any results. It depends. There is a micro-processor IC on it that is irreplaceable. As for your model number I do not remember seesing a 31MF231D. If its a 32MF231D, I have a comprehensive service manual that I can give you. It should make your job a lot easier. Ofcourse I will guide you if you need something. So the first thing you should check is the model number. A google search for your model returns hardly any results.

Thats not necessary. I will just upload it to mediafire and get you the link. Thats not necessary. I will just upload it to mediafire and get you the link.

Here's the service manual
http://www.mediafire.com/?5y6kbv8cc32m33...
Here's the service manual
http://www.mediafire.com/?5y6kbv8cc32m330

Oh, so you haven't checked all the caps? Yes that seems to be the problem. You have got the service manual now, there's a detailed schematic in it. Check the voltages and see if any of them are missing. As for the diode, you can just check if its shorted. Oh, so you haven't checked all the caps? Yes that seems to be the problem. You have got the service manual now, there's a detailed schematic in it. Check the voltages and see if any of them are missing. As for the diode, you can just check if its shorted.

Ok. I do not advice replacing the diode with an inductor though. As you may know the diode will not allow the current to flow in reverse bias mode, where as an inductor has no such thing. Its just a temporary solution, I would say. Ok. I do not advice replacing the diode with an inductor though. As you may know the diode will not allow the current to flow in reverse bias mode, where as an inductor has no such thing. Its just a temporary solution, I would say.

You are welcome. If you do get stuck somewhere. Let me know and I will see you through it. You are welcome. If you do get stuck somewhere. Let me know and I will see you through it.

On which board and which component? On which board and which component?

Oh. Thats the one going to the inverter. I forgot to ask you do you have sound? Oh. Thats the one going to the inverter. I forgot to ask you do you have sound?

Well thats a tricky situation. What do you wanna do, try and replace the power board? Well thats a tricky situation. What do you wanna do, try and replace the power board?

Well lets continue the diagnosis. Its a tricky situation. I do not want to take a chance and tell you to replace the wrong board. Reading page 70 I have seen that pin 6 has not function. Also by gray screen do you mean that the backlight is lit? Well lets continue the diagnosis. Its a tricky situation. I do not want to take a chance and tell you to replace the wrong board. Reading page 70 I have seen that pin 6 has not function. Also by gray screen do you mean that the backlight is lit?